Cognitive Load

The notification isn't the problem. Getting back is.

Reading a Slack ping takes ten seconds. Getting back into focused work afterward takes around twenty-three minutes. That gap is where your day goes.

October 14, 2026 · 2 min read

The Hidden Toll of Interrupted Work

Everyone blames notifications. But the notification is just the trigger. The expensive part is what happens when you try to deal with it: the hidden tax on your brain and body.

The Speed Trap

When researchers tested how people handle frequent workplace interruptions, they uncovered a surprising finding: people don't necessarily take longer to finish an interrupted task. Instead, they work faster. To make up for lost time, people accelerate their pace and shorten their communication to compensate (Mark, Gudith and Klocke, 2008).

You aren't taking the slow path back; you're stepping on the gas pedal to catch up.

The Hidden Cost

Working faster to offset interruptions isn't a superpower, it's a stress engine. The same research revealed that this accelerated pace comes at a severe psychological cost. After just 20 minutes of interrupted work, participants reported significantly higher levels of stress, frustration, time pressure, mental workload, and physical effort (Mark, Gudith and Klocke, 2008).

The danger of notifications isn't just lost time. It's that constant context-switching forces you into an anxious, high-gear survival mode to get through the day.

Protecting Your Attention

Turning notifications off is a start, but it doesn't touch the internal habit of checking. These strategies help protect your focus blocks:

Check email and chat in set windows. Open them two or three times a day. Outside those windows, keep the apps closed rather than muted.
Work in single-task blocks of 45 to 90 minutes. Focus on one task with one set of tabs and put your phone in another room. It takes time to get deep into complex work.
Leave yourself a note before you stop. Write a single line about the next step before leaving a task. It makes jumping back in much cheaper.
Expect the warm-up. The first ten minutes of a focus block feel unproductive because you're climbing back into context. Give yourself time to settle in.

The Bottom Line

Your attention isn't a tap you can turn on and off without consequences. Pushing yourself to work faster amidst constant interruptions drains your mental energy long before the day ends. Protecting your focus blocks isn't about rigid discipline it's about stopping the hidden tax of constant switching.

References

1. Mark, G., Gudith, D., & Klocke, U. (2008). The cost of interrupted work: more speed and stress. Proceedings of CHI 2008, 107–110.

Get the next one

One short, evidence-based email a week. No fluff, no “journeys.”